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beep747

Posted 10 July 2017 - 08:56 AM

beep747

New Member

Member

5 posts

Here's my problem.
I purchased a new case (cooler master cosmos se) and a new motherboard (as rock b85 pro4 1150) for hosting my new CPU (intel 4790k). In my old case, I had a 1155 motherboard and I transferred my 32 gig Ram, my graphics card (nvidia 1070 gtx) and all my drives to the new case. I installed also a new psu (Corsair rmi 750i).
I connected the atx 24 pin cable and the atx 12v 8 pin cable, my ddr3 memory sticks, my 1070 gtx and the power switch from the case. Then I tested. The fans spooled up, I got system beeps. So far so good. Then I connected the other cables from the case (reset switch, pled, hdled and USB 3.0 connector cable.) Then I tested again and the differential on the fuse board in the house tripped.
After that, I stripped the motherboard down to the essentials again and tested again. Now, the CPU fan and PSU fan start, but stop after a few seconds. No more beeps from the system speaker. When I disconnect the smaller of the two parts of the atx cable and I power up the PSU, the two fans start and keep running.
I suppose the short circuiting did damage but would it be to the motherboard or to the CPU?
I tried everything the forum offers but nothing helps.
So, any advise would be very very welcome.

Jos

Edited by beep747, 10 July 2017 - 09:49 AM.

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phillpower2

Posted 11 July 2017 - 03:30 AM

phillpower2

Tech Staff

Technician

21,492 posts

beep747,

I got system beeps.

I don`t see an onboard speaker on the MB in the user manual, did you fit your own.

I suggest that you remove the MB and do a barebones set-up on a piece of cardboard (make sure it is larger than the MB) only connect the PSU, the screen to one of the video ports on the MB, 1 stick of Ram and the keyboard.

Your MB doesn`t have a power test switch so you will then need to short out the 2 power on pins on the MB header to get the PSU to activate, you can use a small flat bladed screwdriver or a paper clip bent into a U shape (see attachment below) this is perfectly safe if you do not touch anything else, the idea is to see if we can get a BIOS screen if you do you can then add one component at a time until you find the problem component, you must power down and remove the power cord from the wall socket before adding another component.

Attached Thumbnails

beep747

Posted 11 July 2017 - 05:42 AM

beep747

New Member

Topic Starter

Member

5 posts

Yes, there is a plugin system speaker that came with the mobo.
Thank you for your expert advise.
This morning however, I managed to get an old PSU from a friend. With just the required minimum components attached, the CPU and motherboard kept powered. So it seems that the culprit would be the PSU.
When I get my replacement PSU (my friends one isn't a powerful enough), I will start building and will report back.

phillpower2

Posted 11 July 2017 - 06:01 AM

phillpower2

Tech Staff

Technician

21,492 posts

While not perfect identifying the PSU as the cause is better than the MB and CPU etc turning out to be bad.

While you wait on the replacement PSU, why not set up the computer using one of the integrated graphics ports, you can then install Windows and the MBs chipset drivers and only leave yourself to fit the GTX 1070 and swap out the PSUs when the new one arrives.

Yes, there is a plugin system speaker that came with the mobo.

That is a rarity nowadays, they cost so little but most board manufacturers don`t supply them as standard.